Due to the amplitude and frequency of output voltage of inverter was unstable with conventional droop control in microgrid, an improved adaptive droop control was proposed, which added error feedback of voltage and frequency. So it could reduce the deviation of output voltage amplitude and frequency when loads suddenly changed. At the same time the traditional threephase inverter control based on the dqrotating coordinate system, the assault of power to grid was very large, but control based on αβstationary coordinate system could effectively reduce the assault of power to grid, and it improved the stability of the system. Through the MATLAB simulation, verified the feasibility of the system which used the method proposed.